For people who constantly lose their keys it might sound like the perfect life-hack. Implanted devices are capable of opening locked doors or giving their hosts authorisation to use electronic devices like office photocopiers and printers. Now one Swedish firm is offering to inject its staff with microchips for free and dozens are taking up the offer. But like many new technologies, it has its downside.

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For people who constantly lose their keys it might sound like the perfect life-hack. Implanted devices are capable of opening locked doors or giving their hosts authorisation to use electronic devices like office photocopiers and printers. Now one Swedish firm is offering to inject its staff with microchips for free and dozens are taking up the offer. But like many new technologies, it has its downside.